Remove the deprecated function ExtensionService::extensions().

chrome/browser/extensions/updater/extension_updater_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <list>
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 439 matching lines @@
   ~ServiceForManifestTests() override {}
 
   const Extension* GetExtensionById(const std::string& id,
                                     bool include_disabled) const override {
     const Extension* result = registry_->enabled_extensions().GetByID(id);
     if (result || !include_disabled)
       return result;
     return registry_->disabled_extensions().GetByID(id);
   }
 
-  const ExtensionSet* extensions() const override {
-    return &registry_->enabled_extensions();
-  }
-
   PendingExtensionManager* pending_extension_manager() override {
     return &pending_extension_manager_;
   }
 
   const Extension* GetPendingExtensionUpdate(
       const std::string& id) const override {
     return NULL;
   }
 
   bool IsExtensionEnabled(const std::string& id) const override {
@@ skipping 1785 matching lines @@
 // -prodversionmin (shouldn't update if browser version too old)
 // -manifests & updates arriving out of order / interleaved
 // -malformed update url (empty, file://, has query, has a # fragment, etc.)
 // -An extension gets uninstalled while updates are in progress (so it doesn't
 //  "come back from the dead")
 // -An extension gets manually updated to v3 while we're downloading v2 (ie
 //  you don't get downgraded accidentally)
 // -An update manifest mentions multiple updates
 
 }  // namespace extensions